import javax.media.j3d.*;
import java.util.Enumeration;

public class MorphBehavior extends Behavior
{
  Morph targetMorph;
  Alpha alpha;
  int numWeights;
  double[] weights;
  WakeupCondition trigger = new WakeupOnElapsedFrames(0);

  MorphBehavior(Morph target, Alpha morphAlpha, int numWts)
  {
      targetMorph = target;
      alpha = morphAlpha;
      numWeights = numWts;
      weights = new double[numWeights];
  }

  public void initialize()
  {
      wakeupOn(trigger);
  }

  /**
   * Defines the morphing parameters. See textbook for
   * details.
   */
  public void processStimulus(Enumeration criteria)
  {
      for (int i = 0; i < numWeights; i ++) {
        weights[i] = 0.0;
      }
      float alphaValue = numWeights * alpha.value();
      int alphaIndex = (int) alphaValue;
      weights[alphaIndex] = 1.0 - (alphaValue - alphaIndex);
      if(alphaIndex < numWeights - 1) {
        weights[alphaIndex + 1] = 1.0 - weights[alphaIndex];
      } else {
        weights[0] = 1.0 - weights[alphaIndex];
      }

      targetMorph.setWeights(weights);
      wakeupOn(trigger);
  }
}